Recently, the idea of large extra dimensions has attracted much
attention to construct theories in which gravity is unified with
other forces [1]}. One of the most interesting problems is
the verification of extra dimensions by physical phenomena. For this
purpose higherdimensional black holes in accelerators
[2]}, [3]} and in cosmic rays
[4]}-[5]} and gravitational waves from
higher-dimensional black holes [6]} are studied. The
five-dimensional Einstein-Maxwell theory with a Chern- Simons term
predicted five-dimensional charged black holes [7]}. Such
a higher-dimensional black holes would reside in a spacetime that is
approximately isotropic in the vicinity of the black holes, but
effectively four-dimensional far from the black holes
[8]}. These higher dimensional black holes are called
Kaluza-Klein black holes. The presence of extra dimension is tested
by quasinormal modes from the perturbation around the higher
dimensional black hole [9]}-[10]} and the spectrum of
Hawking radiation [11]}-[12]}.
The gravitational lensing is another method to investigate the extra
dimension. Thus, the study of strong gravitational lensing by higher
dimensional black hole can help us to extract information about the
extra dimension in astronomical observations in the future. The
Kaluza-Klein black holes with squashed horizon [13]} is
one of the extra dimensional black holes and it's Hawking radiation
and quasinormal modes have been
investigated in some papers
[14]}-[15]}. Also, the
gravitational lensing of these black holes is studied in several
papers. Liu et al. have studied the gravitational lensing by
squashed Kaluza-Klein black holes in Refs [16]}, [17]} and
Sadeghi et al. investigated the charged type of this black hole
[18]}.
